I see what you are getting at, but I think this kind of mindset is the sort of mindset that caused altcoins to gain so much artificial value and uninformed interest. It causes people to think "If I just hold long enough, any coin will make me a millionaire", and this is just wrong. It is causing a lot of pump and dumps to occur and causing a lot of good technological innovation to get lost in the weeds over the past couple years.
That being said, if you have been mining for awhile and now that you see price is dipping a bit you are deciding to sell your coins this is a big mistake. You're going to get taken for a ride when the coins go back up in price, the coins that have some real value behind them by bringing something powerful to the table that is unique and useful.